Add a helper function to query CBR package name.

Test: manual
Bug: 154436403
Change-Id: Id1e77abc4df88a3d5c3f28b366a7dfb415a2bbb0
Merged-in: Id1e77abc4df88a3d5c3f28b366a7dfb415a2bbb0

1 files changed, 65 insertions, 0 deletions

diff --git a/telephony/common/com/android/internal/telephony/CellBroadcastUtils.java b/telephony/common/com/android/internal/telephony/CellBroadcastUtils.java
new file mode 100644
index 000000000000..6c6375586225
--- /dev/null
+++ b/telephony/common/com/android/internal/telephony/CellBroadcastUtils.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.internal.telephony;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.provider.Telephony;
+import android.text.TextUtils;
+import android.util.Log;
+
+/**
+ * This class provides utility functions related to CellBroadcast.
+ */
+public class CellBroadcastUtils {
+    private static final String TAG = "CellBroadcastUtils";
+    private static final boolean VDBG = false;
+
+    /**
+     * Utility method to query the default CBR's package name.
+     */
+    public static String getDefaultCellBroadcastReceiverPackageName(Context context) {
+        PackageManager packageManager = context.getPackageManager();
+        ResolveInfo resolveInfo = packageManager.resolveActivity(
+                new Intent(Telephony.Sms.Intents.SMS_CB_RECEIVED_ACTION),
+                PackageManager.MATCH_SYSTEM_ONLY);
+        String packageName;
+
+        if (resolveInfo == null) {
+            Log.e(TAG, "getDefaultCellBroadcastReceiverPackageName: no package found");
+            return null;
+        }
+
+        packageName = resolveInfo.activityInfo.applicationInfo.packageName;
+
+        if (VDBG) {
+            Log.d(TAG, "getDefaultCellBroadcastReceiverPackageName: found package: " + packageName);
+        }
+
+        if (TextUtils.isEmpty(packageName) || packageManager.checkPermission(
+                android.Manifest.permission.READ_CELL_BROADCASTS, packageName)
+                == PackageManager.PERMISSION_DENIED) {
+            Log.e(TAG, "getDefaultCellBroadcastReceiverPackageName: returning null; "
+                    + "permission check failed for : " + packageName);
+            return null;
+        }
+
+        return packageName;
+    }
+}